Digital IO


LabJack makes multiple data acquisition (DAQ) and control products with digital inputs and outputs. The devices Digital I/O systems differ in quantity, logic level, and LJTick Compatibility.

Product Comparison

U12 U3-LV U3-HV U6 U6-Pro UE9 UE9-Pro T4 T7 T7-Pro
Logic Level 5V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
Digital I/O 20 20 16 20 20 23 23 16 23 23
Counters 1 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 10 Up to 10 Up to 10
LJTick Compatible [1] No Yes Yes Yes Yes Yes Yes Yes Yes Yes
Screw Terminals
On Board 4 8 4[2] 4 4 4 4 4[2] 4 4
With CB15/CB37 20 20 16 20 20 23 23 16 23 23
  1. Useful LJTicks for digital inputs and outputs are the LVDigitalIO, OutBuff, Divider, DigitalOut5V, and the RelayDriver
  2. The U3-HV and T4 have 4 dedicated high-voltage analog input lines that can't be switched into digital mode.

LabJack also makes several accessories to assist with common digital circuitry demands. Useful accessories for digital inputs and outputs are:

  • RB12 - Provides 12 industry standard relay module sockets.
  • PS12DC - Provides 12 optically isolated switches for power switching applications.
  • LJTick-LVDigitalIO - Bidirectional logic shifting board for communicating with digital circuitry at 3.3V, 2.5V, or 1.8V logic levels.
  • LJTick-OutBuff - Can be used to circuitry with higher current requirements.
  • LJTick-Divider - Useful for interfacing with higher voltage circuitry.
  • LJTick-DigitalOut5V - Converts 3.3V to 5V which is good for controlling relays.
  • LJTick-RelayDriver - Allows digital I/O lines to control a relay or other moderate loads.

For more information about our devices digital input/output systems please look at their datasheets.

DAQ Devices

$429/$369 OEM
High performance, USB, Ethernet, WiFi
  • USB, Ethernet, and WiFi connectivity
  • Fully compatible with Modbus TCP
  • 14 analog inputs
  • 16+ bits of resolution
  • T7-Pro: Up to 22-bit resolution
  • ±10V, ±1V, ±0.1V, and ±0.01V ranges
  • 100k samples/s max stream rate
  • Expand to 84 channels with Mux80
  • Optional NIST traceable Calibration Certificate.
  • AIN-EF: Hardware scaling & processing
  • 2 analog outputs
  • 23 digital I/O
  • Up to 12 timer and counter features
  • Run Lua scripts in hardware
T7-OEM: 359.00
T7-Pro-OEM: 459.00
T7: 429.00
T7-Pro: 529.00
$199/$169 OEM
Low cost USB and Ethernet
  • USB and Ethernet connectivity
  • Fully compatible with Modbus TCP
  • Up to 12 analog inputs
  • 12-bit resolution
  • 4 dedicated ±10V analog inputs
  • Up to 8 0-2.5V analog inputs
  • 50 ksamples/s max speed
  • AIN-EF: Hardware scaling & processing
  • 2 analog outputs
  • Up to 16 digital I/O
  • Up to 10 timer and counter features
  • Run Lua scripts in hardware
T4: 199.00
T4-OEM: 169.00
$115/$81 OEM
Our most affordable DAQ
  • USB Connectivity
  • Up to 16 analog inputs
  • 12-bit resolution
  • Some 0-2.4V range and some ±10V range
  • 50 ksample/s max stream rate
  • 2 analog outputs
  • Up to 20 digital I/O
  • 2 timers and 2 counters
U3-LV: 115.00
U3-HV: 119.00
U3-LV-OEM: 81.00
U3-HV-OEM: 85.00
$319/$279 OEM
Exceptional price and performance
  • USB Connectivity
  • 14 high quality analog inputs
  • 16+ bits of resolution
  • U6-Pro: Up to 22-bit resolution
  • ±10V, ±1V, ±0.1V, and ±0.01V ranges
  • 50 ksamples/s max stream rate
  • Expand to 84 channels with Mux80
  • Optional NIST traceable Calibration Certificate.
  • 2 analog outputs
  • 20 digital I/O
  • 4 timers and 2 counters
U6: 319.00
U6-Pro: 389.00
U6-OEM: 279.00
U6-Pro-OEM: 329.00
$519/$619 Pro
The original USB and Ethernet DAQ
  • USB and Ethernet connectivity
  • 14 analog inputs
  • 12–16 bit resolution
  • UE9-Pro: Up to 20-bit resolution
  • ±5V and 0-5V ranges
  • 50 ksamples/s max stream rate
  • Expand to 84 channels with Mux80
  • 2 analog outputs
  • 23 digital I/O
  • 6 timers and 2 counters
UE9: 519.00
UE9-Pro: 619.00
$149/$109 OEM
The original LabJack
  • Our original groundbreaking USB DAQ device
  • 8 analog inputs, 12 bit resolution, 1.2 ksamples/s
  • 2 analog outputs
  • 20 digital I/O
  • 1 counter
U12-NTH: 109.00
U12-PH: 119.00
U12: 149.00

Product Comparison

T-Series

UD Series
Legacy
U3-LV U3-HV U6 U6-Pro T4 T7 T7-Pro
Voltage Range[1] 0-2.4V ±10V [1] ±10V ±10V ±10V[4] ±10V ±10V
Analog Inputs 16 16 14 14 12 14 14
Effective Resolution [2] 12 bits 12 bits 16 bits 22 bits 12 bits 16 bits 22 bits
Digital I/O 20 16 20 20 16 23 23
Logic Level 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
Analog Outputs 2 2 2 2 2 2 2
Counters Up to 2 Up to 2 Up to 2 Up to 2 Up to 10 Up to 10 Up to 10
USB Yes Yes Yes Yes Yes Yes Yes
LJTick Compatible Yes Yes Yes Yes Yes Yes Yes
Internal Temp Sensor Yes Yes Yes Yes Yes Yes Yes
Thermocouple Ready [3] No No Yes Yes No Yes Yes
Ethernet No No No No Yes Yes Yes
Modbus TCP No No No No Yes Yes Yes
Scripting No No No No Yes Yes Yes
Wireless No No No No No No Yes
Real-time Clock No No No No No No Yes
OEM Version Yes Yes Yes Yes Yes Yes Yes
Recommended [5] Yes Yes Yes Yes Yes Yes Yes
[1] Can be configured for -10V to +20V range.
[2] According to actual measured data, see related Noise and Resolution (App Note)
[3] If not thermocouple ready, can purchase an amplifier like the LJTick-InAmp, see related Thermocouples (App Note)
[4] The T4 has 4 high voltage (±10V) and up to 8 low voltage (0-2.5V) analog input lines
[5] The U12, UE9, and UE9-Pro are older devices and are not recommended for most new applications. Consider using the T4, T7, U3, or U6.

For more details, see the comparison page.